// 云函数入口文件
const cloud = require('wx-server-sdk')

cloud.init({
  env: 'yiibook-pro-yo19d'
})

// 云函数入口函数
exports.main = async (event, context) => {
  return await cloud.database().collection('subscribes')
  .where({
    openid: event.openid,
    examId: event.examId
  }).remove()
}